Would you term Google's Captchas as Turing Test?
In the standard Turing test (or imitation game), the interrogator can ask multiple arbitrary questions, while, in the case of captchas, usually, there's only one question or problem. Additionally, in the Turing test, the interrogator interactively communicates with both the human and the machine. Furthermore, captchas do not test the conversational skills but only the visual ones of the AI. Therefore, the existing captchas are not an example of the standard Turing test.